The Horse Collar tackle was legal in the NFL until 2005. In May of 2005 the NFL Competition Committee voted 27-5 to ban the use of the Horse Collar Tackle. The use of the Horse Collar Tackle was banned because of a number of serious injuries were caused by it's use, most notably to Philadelphia Eagles quarter back Donovan McNabb and wide receiver Terrell Owens.
The penalty for a horse collar tackle was brought into the spotlight by former Dallas Cowboys safety Roy Williams.
15 yard and repeat down
A Horse collar is something that goes around a horses head so that you can lead it round with you or tie it up but not tight in a horse box
The horse helped feed China. The collar was just a way to hook him to a plow.
the chines invented horse collar by making another version of a yoke. because the chines thought it would be easier than pull a horse with a tractor
The collar that is worn by the horse when pulling a load predates the ancient Egyptians, which would make it about 7000 years old.
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Collar
If you mean when a horse is pulling a wagon or equipment, the collar is called a collar. The metal bars that run along the groove in the collar and come up over his withers are called hames. Usually, those parts are referred to together as collar and hames. One won't do any good without the other.
Leg, knee, and ankle
3rd millennium B.C.